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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ecdee0782212900041beb4d18969ef2aad8b2074cfe2d8deb3a44a2d789802' 
  AND token = 'I3KTuNJUyLkzZdo0b9HodzJk2eo8196Ck8KM30o+rkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}